common.py

"""
This file contains important information for the calculator.
"""

from collections import namedtuple, OrderedDict
from enum import Enum
from typing import List

Token = namedtuple('Token', ('name', 'value'))
Value = namedtuple('Value', ('type', 'value'))


class RuleMatch:
    def __init__(self, name: str, matched: List[Token], value: Value = None):
        self.name = name
        self.matched = matched
        self.value = value

    def __str__(self):
        return 'RuleMatch(' + ', '.join(map(str, [self.name, self.matched, self.value])) + ')'

    def __repr__(self):
        return str(self)


token_map = OrderedDict((
    (r'\d+(?:\.\d+)?',      'NUM'),
    (r'sqrt',               'OPR'),
    (r'exp',                'OPR'),
    (r'det',                'OPR'),
    (r'adj',                'OPR'),
    (r'trans',              'OPR'),
    (r'cof',                'OPR'),
    (r'inv',                'OPR'),
    (r'[a-zA-Z_]+',         'IDT'),
    (r'=',                  'EQL'),
    (r'\+',                 'ADD'),
    (r'-',                  'ADD'),
    (r'\*\*',               'POW'),
    (r'\*',                 'MUL'),
    (r'\/',                 'MUL'),
    (r'%',                  'MUL'),
    (r'\^',                 'POW'),
    (r'\(',                 'LPA'),
    (r'\)',                 'RPA'),
    (r'\[',                 'LBR'),
    (r'\]',                 'RBR'),
    (r'\,',                 'CMA'),
    (r'\|',                 'PPE')
))

remove = ('EQL', 'LPA', 'RPA', 'LBR', 'RBR', 'CMA', 'PPE')

rules_map = OrderedDict((
    ('idt', ('IDT EQL add', 'mat')),
    ('mat', ('LBR mbd RBR', 'add')),
    ('mbd', ('mrw PPE mbd', 'mrw', 'add')),
    ('mrw', ('add CMA mrw', 'add')),
    ('add', ('mul ADD add', 'mui', 'mul')),
    ('mui', ('pow mul',)),
    ('mul', ('pow MUL mul', 'pow')),
    ('pow', ('opr POW pow', 'opr')),
    ('opr', ('OPR LPA mat RPA', 'neg')),
    ('neg', ('ADD num', 'ADD opr', 'num')),
    ('num', ('NUM', 'IDT', 'LPA add RPA')),
))

left_assoc = {
    'ADD': 'add',
    'MUL': 'mul',
}


class Type(Enum):
    Number = 0
    Matrix = 1
    MatrixRow = 2


value_map = {
    'NUM': Type.Number,
    'MAT': Type.Matrix,
    'MRW': Type.MatrixRow
}